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William Blair Investment Management

William Blair Investment Management Portfolio holdings

AUM $30.3B
1-Year Est. Return 33.75%
This Fund
S&P 500
This Quarter Est. Return
-0.1%
1 Year Est. Return
+33.75%
3 Year Est. Return
+108.55%
5 Year Est. Return
+126.9%
10 Year Est. Return
+771.69%
AUM
$30.3B
AUM Growth
-$5.59B
Cap. Flow
-$4.09B
Cap. Flow %
-13.52%
Top 10 Hldgs %
30.62%
Holding
459
New
46
Increased
157
Reduced
205
Closed
46

Top Buys

Rank Stock Value
1
AZN icon
AstraZeneca
AZN
+$370M
2
AKAM icon
Akamai
AKAM
+$162M
3
BWA icon
BorgWarner
BWA
+$152M
4
APH icon
Amphenol
APH
+$152M
5
SYNA icon
Synaptics
SYNA
+$129M

Top Sells

Rank Stock Value
1
NVDA icon
NVIDIA
NVDA
+$309M
2
SE icon
Sea Limited
SE
+$302M
3
AMZN icon
Amazon
AMZN
+$269M
4
MSFT icon
Microsoft
MSFT
+$248M
5
CIEN icon
Ciena
CIEN
+$214M

Sector Composition

Rank Sector Weight
1 Technology 36.13%
2 Healthcare 12.59%
3 Industrials 11.81%
4 Financials 11.55%
5 Consumer Discretionary 10.11%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
UMBF icon
276
UMB Financial
UMBF
$10.7B
$15.1M 0.05%
133,550
-92,296
-41% -$11.1M
ESRT icon
277
Empire State Realty Trust
ESRT
$969M
$15.1M 0.05%
2,894,917
+93,536
+3% +$562K
TSEM icon
278
Tower Semiconductor
TSEM
$25.3B
$14.8M 0.05%
84,094
-294,886
-78% -$39.6M
EPC icon
279
Edgewell Personal Care
EPC
$1.28B
$14.7M 0.05%
686,763
+23,308
+4% +$469K
AVY icon
280
Avery Dennison
AVY
$12.5B
$14.6M 0.05%
+84,465
New +$15.5M
OMF icon
281
OneMain Financial
OMF
$7.08B
$14.5M 0.05%
271,107
-168,589
-38% -$10M
AAMI
282
Acadian Asset Management
AAMI
$2.95B
$14.4M 0.05%
263,737
+8,651
+3% +$456K
INVX
283
Innovex International
INVX
$1.85B
$14.3M 0.05%
587,123
+1,748
+0.3% +$43.9K
QTWO icon
284
Q2 Holdings
QTWO
$3.64B
$14.3M 0.05%
302,134
-2,392,584
-89% -$135M
JBI icon
285
Janus International
JBI
$732M
$14.1M 0.05%
2,729,756
+91,790
+3% +$594K
GVA icon
286
Granite Construction
GVA
$5.49B
$13.8M 0.05%
114,985
-96,863
-46% -$12.1M
PAY icon
287
Paymentus
PAY
$3.96B
$13.7M 0.05%
537,843
+27,345
+5% +$719K
TXRH icon
288
Texas Roadhouse
TXRH
$13.2B
$13.6M 0.05%
+82,567
New +$14.8M
GRAB icon
289
Grab
GRAB
$13.7B
$13.6M 0.04%
3,706,898
-18,969,385
-84% -$80.5M
YETI icon
290
Yeti Holdings
YETI
$3.86B
$13.4M 0.04%
367,401
-92,419
-20% -$4.07M
JAZZ icon
291
Jazz Pharmaceuticals
JAZZ
$16B
$13.4M 0.04%
+70,883
New +$12.4M
INVA icon
292
Innoviva
INVA
$1.57B
$13.4M 0.04%
+574,825
New +$12.4M
HAYW icon
293
Hayward Holdings
HAYW
$3.16B
$13.3M 0.04%
994,229
-828,014
-45% -$12.9M
SANM icon
294
Sanmina
SANM
$11.2B
$13.2M 0.04%
101,655
-127,707
-56% -$18.8M
PGNY icon
295
Progyny
PGNY
$2.47B
$12.6M 0.04%
+739,790
New +$15.9M
SKYW icon
296
Skywest
SKYW
$4.37B
$12.3M 0.04%
+134,374
New +$13.2M
MBUU icon
297
Malibu Boats
MBUU
$557M
$12.3M 0.04%
+475,796
New +$14.2M
TITN icon
298
Titan Machinery
TITN
$469M
$12.3M 0.04%
737,258
+42,154
+6% +$732K
DXCM icon
299
DexCom
DXCM
$28.3B
$12.3M 0.04%
195,431
+23,858
+14% +$1.66M
ASR icon
300
Grupo Aeroportuario del Sureste
ASR
$8.06B
$12.2M 0.04%
36,355
-2,399
-6% -$822K
10 11
12
13 14

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William Blair Investment Management's Q1 2026 Portfolio in Review

As of Q1 2026, William Blair Investment Management held 459 positions worth $30.3B, down 16% from $35.9B the previous quarter. Its ten largest holdings account for 31% of the portfolio.

William Blair Investment Management withdrew a net $4.09B in Q1 2026, closing 46 positions and reducing 205 holdings. Its most notable exit was Sea Limited, an estimated $302M position sold in full.

By sector, the portfolio is most concentrated in Technology at 36% of assets, down from 38% a quarter earlier, followed by Healthcare and Industrials.

Against the trend, William Blair Investment Management opened a new position in Akamai worth $186M.

  • William Blair Investment Management's largest Q1 2026 buy was Akamai: 1,619,060 shares worth $186M.
  • William Blair Investment Management added most to AstraZeneca in Q1 2026, an estimated $370M increase.
  • William Blair Investment Management's biggest Q1 2026 reduction was NVIDIA, cutting an estimated $309M.
  • William Blair Investment Management fully exited Sea Limited in Q1 2026, selling an estimated $302M.
  • William Blair Investment Management's ten largest holdings make up 31% of its $30.3B portfolio in Q1 2026.
  • William Blair Investment Management opened 46 new positions and closed 46 in Q1 2026.
  • William Blair Investment Management's portfolio value fell 16% quarter-over-quarter to $30.3B.

Based on William Blair Investment Management's 13F filing for Q1 2026, filed 8 May 2026.